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2 specimens found
1 |

Brookite on Quartz
stock #18.1-454
Moses Hill, Magnet Cove, Hot Spring Co.
Arkansas, United States
3.1 x 1.6 x 1.2 CM (thumbnail)
price: $75
Late Summer 2018

Sizable Brookites scattered on a Quartz crystal from the classic locality of Magnet Cove. Choice older piece with several habits of Brookite some of which are very lustrous in person. The Quartz is doubly terminated and is the usual milky to smoky type with some signs of corrosion that is distinctive to this locale. In excellent undamaged condition.
Smithsonite Pseudomorph after Dolomite
stock #15.1-583
Rush Creek, Marion Co.
Arkansas, United States
10.2 x 6.7 x 3.7 CM (cabinet)
price: $300
Spring update

The classic habit of saddle shape Dolomite crystals completely replaced by sparkling smithsonite. The matrix is also nearly all Smithsonite and mostly composed of the rare red-orange color but also has zones of the more typical yellow. A long running debate concerns the color being caused by either Cadmium or Greenockite inclusions. To me it is a distinction without a difference, Greenockite is simply Cadmium Sulfide and so that Cadmium is ultimately the source for the color. In good condition, only a few very minor abrasions can be seen, the Dolomite saddles are quite large and stand well above the matrix.
2 specimens found
1 |